Runtime extensions to a GWT application

We want to create certain "hooks" into our GWT program.  For example, we have a general user interface with toolbars, forms, etc.  We want to be enable third parties to add icons to out toolbars through some predefined specification (UI Binder Type spec perhaps) so that when the app user starts the UI they see our icons and the extended set as well.  

Then when the icon is clicked a portion of the GUI is controlled by the third party specification for it (again with UI Binder type spec) along with the associated code.  So these are akin the Java plugin extensions of a GWT application.  

Does anyone have any ideas about how we may go about this?

Thanks,

Kevin

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